Purity ~85% (SDS-PAGE). Rubredoxin is a small nonheme, iron protein lacking acid-labile sulfide. Its single Fe, chelated to 4 Cys, functions as an electron acceptor and may also stabilize the conformation of the molecule. Source: Recombinant protein corresponding to aa1-54 from Clostridium pasteurianum Rd, fused to His-SUMO-Tag at N-terminal, expressed in E. coli. Molecular Weight: ~22.04kD AA